Table 8: Inferred inner abundances $x_{\rm XDR}$ from jump models assuming the emission to come from the X-ray dominated inner 1000 AU envelope. The average temperature $T_{\rm av}$ and hydrogen density $n_{\rm H,~ av}$ of the inner 1000 AU region are also given.
Source $T_{\rm av}$ (K) $n_{\rm H,~ av}$ (cm-3) CN NO CO+ SO+
AFGL 2591 180 $4\times 10^6$ $8\times 10^{-07}$ $4\times 10^{-06}$ $2\times 10^{-09}$ $3\times 10^{-09}$
W3 IRS 5 490 $6\times 10^7$ $5\times10^{-07}$ $5\times 10^{-06}$ $5\times 10^{-10}$ $3\times 10^{-08}$
IRAS 16293 50 $2\times 10^8$ $8\times 10^{-11}$ ... $2\times 10^{-12}$ $\lesssim $ $5\times 10^{-12}$


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